Commitments

12 Months Ended

Dec. 31, 2011

Commitments

Commitments

13.   Commitments

        The Operating Partnership is committed to various non-cancelable operating leases for land, buildings and equipment. Total minimum rental payments for operating leases are:

	Net Minimum Lease Payments
	(in millions)
2012	$	0.4
2013		0.2
2014		0.1
2015		—
2016		—
2017 and thereafter		—
Total	$	0.7

        Included above is the lease of the Port Terminal at the Verdigris facility. The lease is scheduled to expire on April 30, 2014.

        Rent expense under non-cancelable operating leases for year ended December 31, 2011 was insignificant. Rent expense for the years ended December 31, 2010 and 2009 was $7.7 million and $6.8 million, respectively.

        As of December 31, 2011, we had commitments of approximately $21.9 million related to firm quantities of gas and open purchase orders. The natural gas commitments are based on a firm amount of natural gas at market prices. These natural gas commitments are priced at the beginning of the month of the scheduled activity. We have the option to receive and use the natural gas in our manufacturing operations or we can sell the committed natural gas at current market prices, which may be different than the price that we pay for the natural gas.